Lightning-arrester.



N. E. NORSTROM. LIGHTNING AERESTER.

APPLIGATIQN FILED OUT-'14, 1995. RENEWED AUG. 28, 1909 980,884. PatentedJan.1 911.

LIGHTNING-AZ NURSTROM, OF CHICAGO, ILLINLIS,

66 MANUFACTURING GSL, '82? f iLhSi. Specification D Letters intent.

implication. filed October 14, 1905, Serial No. 2823,?

EIBEREQN ELECTRIC Serial 1.-To. 5515,100.

oil/T whom, -55 may conccm:

' o it known that 1, Nuts EHEL Nons'iinon, iacon oi the United States ofi\l1l1lCfl,

ninl :i vesirlont of Chicago, county of'Coolz.

11nd i'iilelli. of Illinois, have invented Certain a oi esl'vi's, ofwhich the tolloxi 'ing is a speoilimimn.

invention relates to'ligl-itning nrres 's of a; kind used on telephoneand tele- ZliHl has for its object improvein such (lGYlCQS.

izeoinpnnying drawings, which are 3 full size, Figure l is n phi-n;

.s side elevation; and Fig. 3 is :1 sec.-

lino 3 3 Y V i he i iwune o l ilfll'. "hoe shaped piece A of porcelainother i sulating material. Near the ends oi is piece are transverseV-shnpetl moves in which are held Cili'liiGll lese carbon blocks arehehl. in iii-ass clamp bars C, and bolts tonil through the piece A asThe bolts C are also usetl i g )Sl'H for connecting the two hizinehos ofthe telephone or telegraph line in the two hmnohes which extend to the-E ")l.l0i"itl or telegraph instrument nseti. of the mi'oon blocks 0 issecured inside llOH sleeve D which is somewhat The oi'tei' ihnn theblock held by it.

other enrhon block, however, is without any holly of magnetic materialsecured thereto.

The rear face of the piece A has a. recess l filiilil in its centralportion as shown in IiU'llFUtl to the metal bin. E by the sci'ews l) isn. elovh spring S, in the center of tho oils oi whivh is held. a .u'honblock B of l I I The ining H is mljusled so that when the piece i issummed to n Hill or other support, the .tis of the carbon blool; B isnormally in no with (he nxes'of the blocks J. The o the block B havesecured to them 5 is of mica. 13 which intervene beo )looh' B and theadjacent: bloeks C. lhose sir ps of mi ".1. are simply spacing which.cover only a small part of the if 1 S, and in this recess is ii metalbar E seemed to the piece A bjybolt E and screw i 1 'lhe bolt E alsoserves as a binding; post from which there is a conductor E exlemling to:1 ground connection.

,W and useful improvements in Lighti'iingi'aoc il block is but whichserve to prevent nviiuil eon'lzie" between nncl (h i. it; eirres'ieir itis secured 'i all. post, Oi other supn by siri'oivs through the holesA". -The block SHPpOllHl upon the spring S, is pei'ini t l 1 l 4 eblovl; l; which is freely supported oz in spring; 573., does not touchtho other iJlOL when the springis in a quiescent si to, or in a statewhich 21pnearly to the quiescent. One

, himling osis C and the other L one o1? t connected to the two w iii-eother inst U. ginolin Wire is then eon 1 i 1 "w nooml to (no p wzincl"TO ground. When the ilovice set in in this way the spring l l absolutely oiosrllQ/VQK, jam; in the bnihling even o than it personwalking on an i )or, or the Wind blowing outside, nova. spr n (l tovibrate so as to move the block ll with respect to the hlovl'. Thiscontinual vibration of the hlocl; H "with resoeot to the blocks G servesto pi'oveiu. (lost from settling on the faces of the ll'lOCliS zincl.and thus grounding the line i ssot up, the IHlCEL'fRCGd Vllil'illllljgjh does not shoi't circuit a telephone 01' n telegraph circuit passingthrough the hincling posts (1 but When lightning: l'i-ikos one oi theline Wires, the high potnntinl of" the charge causes it to are n hloch Ito block B, and it then it? STzllllg i i, the hay E, post to wound. Thepassage through the coils of the spring is sets up lines of tonesbetween nnwnotie lobcly of the then connected to to shake out dust andchips of carbon due to the are from C to B. The device is thereforeself-cleaning, not .only under normal conditions, but under theconditions arising from acting as an arrester.

What I claim is 1 The combination with a supporting frame, and theconductors of a circuit, of a carbon block connected to each conductorand adjustably supported on the frame, a spring having one end securedto the frame, a third carbon block secured to the other end of thespring and supported adjacent to the first mentioned block, and a groundconnection for the third block.

2. The combination with the conductors of a circuit, of a carbon blockconnected to each conductor, a spring having one end connected to afixed support, a third carbon block connected to the other end of saidspring and supported closely adjacent to the first mentioned blocks anda ground connection for said third block.

3. The combination with the conductors of a circuit, of a carbonterminalconnected to each conductor, a spiral spring secured to a fixed support,a third terminal supported on the tree end of said spring and of acircuit, and a terminal connected to each conductor, of a conductingblock sup ported adjacent to said terminal, a ground connection, ametallic coil interposed between said block and said ground COIIHGC-vtion, and a magnetic body associated with one of said terminals.

5. The combination with the conductors of a circuit, of a horse-shoe1aped frame of insulating material provided with binding posts to whichsaid conductors are connected, carbon blocks located in recesses formedin the legs of said frame, electrical connections from the binding oststo said carbon blocks, and a roun connection provided with a mova leterminal supported between said blocks.

Signed at Chicago, 111., thislOth day of Oct. 1905.

NILS EMEL NORSTROM.

Witnesses g A. L. BUCHANAN, C. L. REDFIELD.

